<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>城市联动</title>
</head>

<body>
    <select id="province">
        <option value="0">北京</option>
        <option value="1">上海</option>
        <option value="2">天津</option>
        <option value="3">重庆</option>
        <option value="4">河北</option>
        <option value="5">山西</option>
        <option value="6">内蒙古</option>
        <option value="7">辽宁</option>
        <option value="8">吉林</option>
        <option value="9">黑龙江</option>
        <option value="10">江苏</option>
        <option value="11">浙江</option>
        <option value="12">安徽</option>
        <option value="13">福建</option>
        <option value="14">江西</option>
        <option value="15">山东</option>
        <option value="16">河南</option>
        <option value="17">湖北</option>
        <option value="18">湖南</option>
        <option value="19">广东</option>
        <option value="20">广西</option>
        <option value="21">海南</option>
        <option value="22">四川</option>
        <option value="23">贵州</option>
        <option value="24">云南</option>
        <option value="25">西藏</option>
        <option value="26">陕西</option>
        <option value="27">甘肃</option>
        <option value="28">宁夏</option>
        <option value="29">青海</option>
        <option value="30">新疆</option>
        <option value="31">香港</option>
        <option value="32">澳门</option>
        <option value="33">台湾</option>
    </select>
    <select name="" id="city"></select>
    <script>
        let cities = new Array();
        cities[0] = "东城,西城,崇文,宣武,朝阳,丰台,石景山,海淀,门头沟,房山,通州,顺义,昌平,大兴,平谷,怀柔,密云,延庆";
        cities[1] = "黄浦,卢湾,徐汇,长宁,静安,普陀,闸北,虹口,杨浦,闵行,宝山,嘉定,浦东,金山,松江,青浦,南汇,奉贤,崇明";
        cities[2] = "和平,东丽,河东,西青,河西,津南,南开,北辰,河北,武清,红挢,塘沽,汉沽,大港,宁河,静海,宝坻,蓟县";
        cities[3] =
            "万州,涪陵,渝中,大渡口,江北,沙坪坝,九龙坡,南岸,北碚,万盛,双挢,渝北,巴南,黔江,长寿,綦江,潼南,铜梁,大足,荣昌,壁山,梁平,城口,丰都,垫江,武隆,忠县,开县,云阳,奉节,巫山,巫溪,石柱,秀山,酉阳,彭水,江津,合川,永川,南川";
        cities[4] = "石家庄,邯郸,邢台,保定,张家口,承德,廊坊,唐山,秦皇岛,沧州,衡水";
        cities[5] = "太原,大同,阳泉,长治,晋城,朔州,吕梁,忻州,晋中,临汾,运城";
        cities[6] = "呼和浩特,包头,乌海,赤峰,呼伦贝尔盟,阿拉善盟,哲里木盟,兴安盟,乌兰察布盟,锡林郭勒盟,巴彦淖尔盟,伊克昭盟";
        cities[7] = "沈阳,大连,鞍山,抚顺,本溪,丹东,锦州,营口,阜新,辽阳,盘锦,铁岭,朝阳,葫芦岛";
        cities[8] = "长春,吉林,四平,辽源,通化,白山,松原,白城,延边";
        cities[9] = "哈尔滨,齐齐哈尔,牡丹江,佳木斯,大庆,绥化,鹤岗,鸡西,黑河,双鸭山,伊春,七台河,大兴安岭";
        cities[10] = "南京,镇江,苏州,南通,扬州,盐城,徐州,连云港,常州,无锡,宿迁,泰州,淮安";
        cities[11] = "杭州,宁波,温州,嘉兴,湖州,绍兴,金华,衢州,舟山,台州,丽水";
        cities[12] = "合肥,芜湖,蚌埠,马鞍山,淮北,铜陵,安庆,黄山,滁州,宿州,池州,淮南,巢湖,阜阳,六安,宣城,亳州";
        cities[13] = "福州,厦门,莆田,三明,泉州,漳州,南平,龙岩,宁德";
        cities[14] = "南昌市,景德镇,九江,鹰潭,萍乡,新馀,赣州,吉安,宜春,抚州,上饶";
        cities[15] = "济南,青岛,淄博,枣庄,东营,烟台,潍坊,济宁,泰安,威海,日照,莱芜,临沂,德州,聊城,滨州,菏泽";
        cities[16] = "郑州,开封,洛阳,平顶山,安阳,鹤壁,新乡,焦作,濮阳,许昌,漯河,三门峡,南阳,商丘,信阳,周口,驻马店,济源";
        cities[17] = "武汉,宜昌,荆州,襄樊,黄石,荆门,黄冈,十堰,恩施,潜江,天门,仙桃,随州,咸宁,孝感,鄂州";
        cities[18] = "长沙,常德,株洲,湘潭,衡阳,岳阳,邵阳,益阳,娄底,怀化,郴州,永州,湘西,张家界";
        cities[19] = "广州,深圳,珠海,汕头,东莞,中山,佛山,韶关,江门,湛江,茂名,肇庆,惠州,梅州,汕尾,河源,阳江,清远,潮州,揭阳,云浮";
        cities[20] = "南宁,柳州,桂林,梧州,北海,防城港,钦州,贵港,玉林,南宁地区,柳州地区,贺州,百色,河池";
        cities[21] = "海口,三亚";
        cities[22] = "成都,绵阳,德阳,自贡,攀枝花,广元,内江,乐山,南充,宜宾,广安,达川,雅安,眉山,甘孜,凉山,泸州";
        cities[23] = "贵阳,六盘水,遵义,安顺,铜仁,黔西南,毕节,黔东南,黔南";
        cities[24] = "昆明,大理,曲靖,玉溪,昭通,楚雄,红河,文山,思茅,西双版纳,保山,德宏,丽江,怒江,迪庆,临沧";
        cities[25] = "拉萨,日喀则,山南,林芝,昌都,阿里,那曲";
        cities[26] = "西安,宝鸡,咸阳,铜川,渭南,延安,榆林,汉中,安康,商洛";
        cities[27] = "兰州,嘉峪关,金昌,白银,天水,酒泉,张掖,武威,定西,陇南,平凉,庆阳,临夏,甘南";
        cities[28] = "银川,石嘴山,吴忠,固原";
        cities[29] = "西宁,海东,海南,海北,黄南,玉树,果洛,海西";
        cities[30] = "乌鲁木齐,石河子,克拉玛依,伊犁,巴音郭勒,昌吉,克孜勒苏柯尔克孜,博尔塔拉,吐鲁番,哈密,喀什,和田,阿克苏";
        cities[31] = "香港";
        cities[32] = "澳门";
        cities[33] = "台北,高雄,台中,台南,屏东,南投,云林,新竹,彰化,苗栗,嘉义,花莲,桃园,宜兰,基隆,台东,金门,马祖,澎湖";

        province.onchange = function () {
            city.options.length=0;
            let i = province.value;
            let x = cities[i].split(',');
            console.log(x);
            for(let index in x){
                let opt = new Option(x[index],index);
                city.options.add(opt)
            }
        }
    </script>
</body>

</html>